Flow control device

Details Flow control device Flow control device

1991-08-29

1994-10-11

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

356316, G01J 330, G01N 2172

Patent

active

053552148

ABSTRACT:
A method and means for accurately regulating the rate of flow of supply gas to the burner or torch of a spectrometer. The flow rate is controlled by a valve having a closure member which is movable between a position at which it provides maximum obstruction to gas flow, and a position at which it provides minimum such obstruction. The closure member movement is controlled by a pulsed electrical signal so that the closure member moves rapidly and repeatedly between each of the two positions. Gas flow rate through the valve is therefore dependent upon the aggregate of the times the closure member spends in either of the two positions referred to, and that flow rate is changed by varying the frequency and/or pulse duration of the pulsed signal.

REFERENCES:
patent: 3926209 (1975-12-01), Sodal et al.
patent: 4201913 (1980-05-01), Bursack et al.
patent: 4220413 (1980-09-01), Targowski
patent: 4373549 (1983-02-01), Nalepa et al.
patent: 4640677 (1987-02-01), Huber
patent: 4669660 (1987-06-01), Weber et al.
patent: 4681530 (1987-07-01), Huber
patent: 4858103 (1989-08-01), Takeuchi et al.
Colaneri, "Solenoid Valve Basics," Instruments and Control Systems, vol. 52, #8, Aug. 1979.

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